WordPress MU

I can't seem to figure this out, please help:

On wp-signup.php there's a password field shown to new users signing up for a blog that says:

(Leave fields blank for a random password to be generated.)
-I want to edit that language.

It looks like the password field and related language get pulled from this line in wp-signup.php:

do_action( 'signup_extra_fields' (line 143)

...But I can't figure out what file/hook/location signup_extra_fields is stored. Can someone point me in the right direction?

Much appreciated!

I'm pretty sure you're using a plugin. That's not standard behavior in WPMU. There are several plugins out there that do that sort of thing though.

Maybe one of the ones in this thread?

http://mu.wordpress.org/forums/topic/11139?replies=9

Thanks DeannS, that was it! I don't even want to tell you how long I tried to figure that out, MUCH appreciated. :-)

Which plugin did you detect the 'signup_extra_fields' action? Im curious because none of the plugins have this inside them.